Empirical formula from percent or gram composition by element, and the molecular formula if you give the molar mass.

Periodic table lookup by symbol, name or atomic number: weight, configuration, electronegativity, melting and boiling points.

Dilution equation C1 x V1 = C2 x V2: give any three values and get the fourth, plus solvent to add and the dilution factor.

Bond type between two elements from the Pauling electronegativity difference: nonpolar covalent, polar covalent or ionic.

Wind forecast for the next 6 to 72 hours: peak and average speed in km/h, mph, knots, direction, Beaufort force and peak time.

NWS wind chill (feels-like in cold wind) from temperature and wind speed in F and C, with frostbite timing when severe.

Peak UV index per day for up to 5 days at any coordinates with the WHO exposure category and protection guidance.

Rain outlook for the next 6 to 48 hours at any coordinates: when it starts, total millimetres, peak hour and intensity.

Outdoor activity screen for the next 3 to 12 hours: temperature, feels-like, rain, wind and UV combined into good, fair or poor.

Limiting reagent, theoretical yield and leftover excess for a balanced reaction from reactant masses; optional percent yield.

Molarity of a solution from solute grams and volume, or the grams of solute needed to make a target molarity and volume.

Convert between grams, moles and molecule counts for a chemical formula using Avogadro's number.

Molar mass and percent composition by element for a formula, including brackets and hydrates such as CuSO4.5H2O.

Ideal gas law PV = nRT: give any three of pressure, volume, moles and temperature and solve the fourth, in common units.

Perp open interest in USD, OI-to-volume ratio and rank on Hyperliquid. Flags leveraged build-up.

Series resistor for an LED from supply voltage, forward voltage and current, with nearest E12 and E24 values and real current.

Decibel conversions: power or voltage ratio to dB and back, and dBm to milliwatts and watts and back.

Squeeze risk for a perp: funding, open interest build-up, 24h move and basis combined into a published points score.

Perp premium to oracle price for a coin on Hyperliquid, in percent, with a stretched/normal verdict.

Battery runtime estimate from capacity (mAh and volts, or Wh) and load (mA or W), with efficiency and usable depth of discharge.